Piston-rod and support therefor.



. T. A. COLEMAN. PISTON ROD AND SUPPORT THEREEOR.

n.: nu. nu.: en. rumumn, msm l.

T. A. COLEMAN.

PISTON ROD AND SUPPORT THEREFOR.

APPLICATION FILED IAN. 2. |918..

Patented Nov. 5, 1918.

2 SHEETS-SHEET 2.

me/Zidi afzzaJ/ (ble/fm,

THOMAS A. COLEMAN,y or VREDENBURGH, ALABAMA.

PISTON-ROD AND SUPPORT THEREFOR. p

Specification `of Letters Patent.

l Application filed January 2, 1918. Serial No'. 209,953.

- ton-Rods and Supports Therefor, of which ment- One of the principal obJects of my lnventhe following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same,'referencebeing had to the accompanying drawings, forming part of .this specication.

My invention relates generally to' saw mills and more particularly to the parts utilized for imparting reciprocating movement to the saw mill carriage during the lumber sawing operations, and which parts include the elongated fluid pressureA cylinder, the piston rod. operating in said cylinder, and

Ythe supporting means for said pistonrod.

`It* will be understood that in long feed .sa-w mills or mills wherein the carriage h as fa comparatively long travel, it is essential to the successful and eflicient operation of lthe carriage, that the knecessarily long pis- .tonyrodbe .maintained in proper alinement and supported so that it will operate to best advantage in its travel through the long feed cylinder, and to this end I have4 devised a piston rodwhich isf comparatively simple in. construction, which can be easily assem- V` i aanmaken apart, which is highly escient in use, and which will not sag within the long, cylindersof saw mills or like structures, the' carriages of which necessarily have a comparatively long reciprocal movetion is t0 providea tubular piston rod which is directly connected to the saw mill carriage, andy further, to provideV a rm and substantial supporting member for said tubular piston rod, said member being constructed and mounted so= asv toreduce to a minimum any tendency to sag. between its ends, which latter action, it will be understood, will materially affect the proper operation andefficiency of the carriage recip- .rocati'ng mechanism.

' A further objectof .my invention is to Aprovidesimple means for effecting` ra step by step rotary movement of the piston rod, thereby minimizing the wear of said rod while in servicei' l' ith the foregoing. and other objects in View, .my invention consists in certain novel Patented Nov. 5, V1918.

features of construction and arrangement of parts, hereinafter more fully described and claimed, and illustrated inthe accompanying drawings, in` which- Y Y Figure 1 is a top plan view of a portion of a saw mill and showing my improved piston rod and piston rod support associated therewith, parts thereof being in section; y

Fig. 2 is a longitudinal section takenv approXimately on the line 2-2 of Fig. 1` with parts broken away; f

Fig. 3 is an enlarged detail section of one end of a Huid pressure cylinder and showing the piston rod and pistonrod support associated therewith;

Fig. 4 is an enlarged detail section taken approximately on the line 4 4 of Fig. 1.

Referring by numerals to the accompanying drawings, 10 designates the track timbers of a saw mill foundation, and ixed in any suitable manner on top of said timbers are track rails 11. Located between these track timbers and anchored in any suitable manner is an elongated fluid pressure cylinder 12, the same being provided near its sure may be delivered into the chamber within the cylinder.

Arranged between the track timbers 10 at suitable distances away from the cylinder 12 are transverse timbers 14 against the outer ends with connections whereby fluid presfaces of which are positioned blocks 1 5.`

Anchored in any suitable manner to these blocks are the endsV of a comparatively largel wire cable 17, the same being under tension so that it is normally maintained Y.

in a taut and rigid condition.

Secured to the timbers 14 are blocks 18,

preferably metal, through which the cable 17 passes, and secured to said block are the ends of a tube 19, the same serving as a..

riage is a bracket 25, and mountedV for rotary movement in the lower end of this bracket is'one endof a tube 26 which incloses a kportion of the tube 19. This inclosingtub@ 26 extends vsuitable manner to the underside of this carplate 24 from which depends a through a suitable stuiiing box on one end ot the cylinder l2, and that end of said tube within the cylinder carries a piston 27. Seated in the end oi the tube on which the piston is ixed is a bushing 28, the same bean ing directly upon the surlace of the inner tube 19.

Where the tube 26 is of considerable length, I prefer to form it in sections and to connect the latter by tubular bushings 26, the same being screw-seated in the adjacent ends of two sections and bearing directly upon the surface of the inner tube. (See Fig.

In order to equalize the wear between tube 26, piston 27 and the cylinder 12, and also the wear between bushings 26@L and 28 and inner tube 19, l provide means for imparting intermittent rotary movement to the tube 26, which means operates automatically during the reciprocatory movement of said tube 26. This means includes a ratchet wheel 29 which is rigidly lixed on the end of tube 26 adjacent to bracket and loosely mounted on the outer tube adjacent to this ratchet wheel is one end of a horizontally disposed lever 30, the same carrying a springpressed pawl B1 which engages the teeth of ratchet wheel 29. A detent 32 is pivotally mounted on the bracket 25 and engages the teeth of ratchet wheel 29 to prevent reverse rotary movement thereof.

Positioned on a suitable support between the track timbers 10 and directly in the path of travel of the free end ot lever 30 is a block 88 provided with oppositely inclined top surfaces.

In operation, it will be understood that steam or fluid pressure is alternately admitted to the ends of cylinder 12 to reciprd cate piston 27 and parts connected thereto. As this operation takes place, the bushings in tubular member 26 slide backward and forward upon tube 19, the latter serving as a substantial support and guide for the elongated piston rod or member 26.

Inasmuch as the carriage 22 is connected to tubular member 26 by bracket 25, said carriage will be reciprocated upon the track rails 11, which latter is supported by timbers 10. During this reciprocating movement, the free end of lever 30 will pass over the oppositely disposed inclined, surfaces on top of block 33, thereby slightly elevating the outer end of said lever, and consequently imparting partial. rotary movement to tubular member 26 through pawl 30 and ratchet wheel 29. Thus the tubular piston rod is slowly rotated simultaneous with its reciprocatory movement, and as a result, the wear between the moving parts is equalized and reduced to a minimum.

A piston rod and piston rod support of my improved construction is comparatively simple, and while particularly designed for use in connection with saw mills utilizing reciprocating carriages, can be advantageously and eiiiciently used wherever acomparatively long feeding movement is necessary.

It will be readily understood that minor changes in the size, form and construction oi the various parts of my improved piston rod and support can be made and substituted for those herein shown and described, without departing from the spirit of my invention, the scope ot' which is set forth in the appended claims.

l claim:

1. In a device of the class described, a member under tension, a sleeve on said member, a tubular member arranged for sliding movement upon said sleeve, and a piston carried by said tubular member.

2. The combination with a fluid pressure cylinder, of tubular member extending axially through said cylinder, a supporting member extending through said tubular member, a tubular piston rod mounted for sliding movement upon said tubular member and extending into the cylinder, and a piston carried by said tubular piston rod.

3. The combination with a fluid pressure cylinder, of a tubular member extending axially through said cylinder, a supporting member extending through said tubular member, a tubular piston rod mounted for sliding movement upon said tubular member and extending into the cylinder, a piston carried by said tubular piston rod, and means for imparting intermittent rotary movement to the tubular piston rod during its reeiprocatory movement.

4. The combination with a fluid pressure cylinder, of a flexible member extending axially through said cylinder, a sleeve mounted on said supporting member and extending through the cylinder, said sleeve and supporting member being normally under tension, a tubular piston rod mounted for sliding movement upon the sleeve and extending into the cylinder, and a piston mounted on said piston rod within said cylinder.

5. The combination with a Huid pressure cylinder, of a flexible member extending axially through said cylinder, a sleeve mounted on said supporting member and extending through the cylinder, said sleeve and supporting member being normally under tension, a tubular piston rod mounted for sliding movement upon the sleeve and extending into the cylinder, a piston mounted on said piston rod within said cylinder,

and means for imparting intermittent rotary movement to said piston rod during its reciprocatory movement.

6. The combination with a fluid pressure cylinder and its piston, of a tubular piston rod secured to said piston, a sleeve extending through said tubular piston rod and through the duid pressure cylinder, and a cable extending through said sleeve.

7. The combination With a fluid pressure cylinder and its piston, of a ltubular piston rod secured to said piston, a sleeve extending through said tubular piston rod and through the fluid pressure cylinder, and a cable extending through said sleeve, said cable and sleeve being normally under tension.

8. In a device of the class described, a

l tubular piston rod support, comprising a tubular member and a cable passing therethrough, said tubular member and cable being normally under tension.

9. The hereindesoribed piston rod sup- .port and guide comprising a tubular member and a cable passing therethrough, the ends of which tubular member and cable are anchored so that they are maintained in a normally taut condition;

10. In a device of the class described, a fluid pressure cylinder, a piston therein, a tubular piston rod secured to said piston, a support extending through said tubular piston rod, and means for imparting partial rotarymovement to said piston rod simultaneous with its reciprocatory movement.

11. A tubular piston rod support comprisis under tension.

18. A tubular piston rod support oomprisi ing a tubular member extending through the tubular piston rod, and a cable passing through said tubular member, the ends of which cable are anchored so that it is in normall taut condition. I

14. T e combination With a tubular piston rod, of a combined guide and support for said piston rod, Which combined guide and support comprises a taut cable, and a tubular member positioned thereupon, said cable and tubular member extending through said tubular piston rod.

In testimony whereof I hereunto aiix my signature this 24th day of Dec., 1917.

THOMAS A. COLEMAN.

Witnesses:

P. C. JORDAN, A. M. WILLIS.

Copies ot this patent may be obtained for five cents each, by addressing the Commissioner of ratentl, Washington, D. C. 

